LIGHT WAVE DEMULTIPLEXER FOR VIDEO PASSIVE LIGHT NETWORK

摘要

PROBLEM TO BE SOLVED: To remove interference by means of the low frequency component of a video signal in the reception of a digital signal with simple constitution by controlling the voltage control current source of a burst mode receiver having non-linear dc cancel performance in a video passive light network. SOLUTION: When input light current Iin contains low frequency current I0 in the receiver 250, the levels of + and - become asymmetrical and the difference Δ of peaks becomes the output of the buffer B. The voltage control current source Cs is controlled by a signal supplied to a low-pass filter LPFB2 and is filtered. Then, the low frequency component Io is canceled from input light current Iin . Only the current Id of the digital signal is supplied to an amplifier A3 and a video signal component can be removed and interference by the video signal can be removed.